‘Partial-interest sales’ are rising as sellers seek to continue to benefit from growing property values

Sales of billion-dollar Manhattan office buildings are rare, but in recent years sellers have been much more willing to part with sizable chunks of them.

Last year, “partial-interest sales” made up 83% of all deals for Manhattan office buildings valued at more than $1 billion, according to real-estate services firm Cushman & Wakefield. In 2015, minority-interest sales made up 42% of such transactions.